Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-06-06
1998-11-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 9, 330 51, 330253, 330311, H03F 345
Patent
active
058382003
ABSTRACT:
A differential amplifier with switched capacitor common mode feedback includes a differential telescopic cascode amplifier in which the differential output terminals are individually coupled to a common mode input bias terminal via separate feedback capacitors. During a first time period (e.g., a sampling period), the output terminals are connected together via a pair of output switches to provide a common mode output voltage in response to a common mode input bias voltage applied to the bias terminal via an input switch. An operational amplifier compares the common mode output voltage to a common mode reference voltage and, based upon the difference between such voltages, generates the common mode input bias voltage. During a second time period (e.g., a holding period), the input and output switches are all opened and the output terminals provide a differential output voltage in response to a differential input signal applied to the differential input terminals.
REFERENCES:
patent: 4714895 (1987-12-01), Nicollini et al.
patent: 4720686 (1988-01-01), Westwick
Germano Nicollini, Pierangelo Confalonieri, and Daniel Senderowicz, "A Fully Differential Sample-and-Hold Circuit for High-Speed Applications", IEEE Journal of Solid-State Circuits, vol. 24, No. 5, Oct. 1989, pp. 1461-1465.
Paul R. Gray and Robert G. Meyer, "MOS Operational Amplifier Design-A Tutorial Overview", IEEE Journal of Solid-State Circuits, vol. SC-17, No. 6, Dec. 1982, pp. 969-982.
Mullins James B.
National Semiconductor Corporation
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